Lock



Dec. 14, 1965 LUNSFORD LOCK 4 Sheets-Sheet 1 FIG. 2

Filed April 13, 1962 FIG. I

INVENTOR. ABNER L. LUNSFORD B ziad dluma $M ATTORNEXZ Dec. 14, 1965 A. L. LUNSFORD 3,222,898

LOCK

Filed April 15, 1962 4 Sheets-Sheet 2 ////////////7/X/P ///////?7 N a i L l W-- w W INVENTOR. ABNER L. LUNSFORD q. E awk; a owl p A TTORNE V61 Dec. 14, 1965 A. L. LUNSFORD LOCK 4 Sheets-Sheet 3 Filed April 13, 1962 INVENTOR. ABNER L. LUNSFORD ATTORNEYS.

Dec. 14, 1965 LUNSFORD 3,222,898

LOCK

Filed April 13, 1962 4 Sheets-Sheet 4 INVENTOR. ABNER L. LUNSFORD BY 7 1841, dam; d ww' A TTORN E Y5.

United States Patent G 3,222,898 LO'CK Abner L. Lunst'ord, Atlanta, Ga., assignor, by mesne assignments, to Anaconda Aluminum Company, Louisville, Ky., a corporation of Montana Filed Apr. 13, 1962, Ser. No. 187,252 15 Claims. (Cl. 743-134) This invention relates to locks, and more particularly to an improved lock especially adapted for employment on doors of the type having a relatively narrow metal frame forming the peripheral portion of the door.

Doors of the type with which the lock of the present invention is especially adapted to be used are widely employed in commercial establishments. Such a door is conventionally constructed from one or two relatively large glass panels which are supported around their periphery in a metallic frame, usually in the form of a hollow tubular aluminum extrusion. Hardware components for supporting, opening and locking the door are conventionally mounted upon the aluminum frame. Since the primary purpose of employing a glass door is for visibility through the door, the aluminum frames are relatively small in transverse dimensions, the width of the frame sides being in the order of two inches, for example. In many installations, double doors are used.

Because of the relatively small transverse dimensions of the aluminum door frames, the physical dimensions of locks which are to be mounted within the door frames are limited. This limitation in turn directly affects the amount of throw or travel which can be imparted to the lock bolt upon actuation of the lock. In the most common form of lock employed with this type of door, the lock bolt is mounted on the door for reciprocation in a horizontal direction and the total amount of reciprocation of the bolt is obviously limited by the horizontal dimension of the aluminum frame member within which the bolt is mounted.

The limited amount of throw of conventional reciprocatory lock bolts imposed by the dimensions of the aluminum door frame members has given rise to a problem which is especially acute in, although not confined to, establishments where double doors are employed. In this type of construction, the free vertical edges of the doors are disposed adjacent each other when the doors are in their closed positions. Normally, these edges are spaced from each other, both to prevent binding and to permit the employment of Weatherstripping material on at least one of the door edges. This spacing between the adjacent door edges decreases the amount by which the lock bolt mounted in one door frame can project into the bolt receiving recess in the opposed door frame. In conventional locks, the amount by which the bolt projects into the bolt receiving recess is of the order of one-half inch.

This situation has been exploited in a number of instances by thieves who have found that the structural characteristics of doors of this type are such that the frames defining the adjoining door edges can be flexed by the use of a crowbar so that the frames can be sprung relative to each other a distance sufiicient to withdraw the lock bolt from its lock receiving recess. A careful practice of this technique enables the door to be sprung a sufficient amount to clear the lock bolt without breaking the glass door panels. To further aggravate the situa tion, after the stolen goods have been removed from the premises, the door frames are again sprung to reinsert the lock bolt into its recess and, since the frames have sufiicient resiliency to return to their original positions, there is little, if any, evidence of the manner of entry.

It is therefore an object of the present invention to provide a new and improved lock wherein a bolt assem- Patented Dec. 14, 1965 bly having a relatively large throw is contained in a lock casing of relatively compact dimensions.

It is another object of the present invention to provide such a lock having a reciprocatory bolt assembly wherein the overall effective length of the bolt assembly may be increased by movement of the bolt assembly to its locked position, and decreased to a minimum length upon return of the bolt assembly to its unlocked position.

The foregoing, and other objects, are achieved in a lock having a telescopic bolt assembly mounted for longitudinal reciprocation within a lock casing. The bolt assembly includes an elongate hollow tubular outer member slideably supported within the casing for movement between a retracted unlocked position and a projected locked position wherein one end of the tubular member projects outwardly from the lock casing. A second bolt member is slideably received within the hollow tubular member for reciprocation longitudinally relative to the tubular member between a retracted position in which the inner member is disposed entirely within the outer member, and a projected position in which the inner bolt member projects outwardly from the outer end of the hollow tubular outer bolt member.

The outer bolt member is shifted between its locked and unlocked positions by conventional structure, and is supported within the casing upon a channel shaped slideway fixedly mounted within the casing. This slideway engages the outer bolt member along its bottom side and its opposite vertical sides. A pinion gear is rotatably mounted in the tubular outer bolt member for rotation about an axis normal to the direction of movement of the outer bolt member. The pinion is in mesh with a horizontal rack tooth section on the slideway, and thus movement of the tubular outer bolt member between its locked and unlocked positions causes the pinion gear to rotate as it is carried along the rack by the outer bolt member.

The inner bolt member is formed with a rack tooth section which also meshes with the pinion gear, and rotation of the pinion is employed to shift the inner bolt member between its retracted and projected positions relative to the tubular outer bolt member. The relationship between the pinion and respective rack tooth sections is such that when the hollow tubular outer bolt member is shifted from its unlocked to its locked position, the pinion drives the inner bolt member from its retracted to its projected position. Thus, during movement of the bolt assembly toward the locked position, projecting the inner bolt member effectively increases the length of the overall bolt assembly, thus substantially doubling the amount by which the bolt assembly projects from its casing when in the locked position.

Other objects and features of the invention will become apparent by reference to the following specification and to the drawings.

In the drawings:

FIG. 1 is a partial front elevational view of a door employing a lock embodying the present invention, with certain parts broken away or shown in sections;

FIG. 2 is an enlarged edge view of the lock carrying door section of FIG. 1 with certain parts broken away and with the lock disposed in its unlocked condition;

FIG. 3 is a detail cross-sectional view taken on line 3-3 of FIG. 2;

FIG. 4 is a detail cross-sectional view of the lock assembly taken on line 44 of FIG. 2;

FIG. 5 is a detail cross-sectional view similar to FIG. 4 showing the lock assembly in a position intermediate its unlocked and locked positions;

FIG. 6 is a detail cross-sectional view similar to FIG.

4, showing the lock mechanism in its fully locked position;

FIG. 7 is a detail cross-sectional view taken on line 77 of FIG. and

FIG. 8 is an exploded perspective view of the lock mechanism.

Referring first to FIG. 1, a lock designated generally 20 embodying the present invention is shown mounted within the vertical side frame member 22 of a glass door designated generally 24. In FIG. 1, lock 20 is shown in its locked position in which a bolt assembly designated generally 26 projects outwardly from door frame 22 to be received within a suitably formed recess in a facing vertical frame member 28 which may form part of a mating swinging door or of a stationary side light. As best seen in FIGS. 3 through 7, vertical side frame member 22 is of hollow box-like shape in transverse cross-section and is formed with a pair of forwardly projecting side flanges 30 between which a separable astragal 32 is received. The front web 34 is formed with an opening 36, best seen in FIG. 2, adapted to accept the main body of the casing of lock 20, while astragal 32 is formed with a cooperating opening 38 affording an operating passage through which the bolt assembly of the lock projects.

The casing of lock 20 is formed in two parts, a main body portion 40 and a side coverplate 42, the structure of these two elements being best shown in FIG. 8. Main body portion 40 is a single casting, or molded piece, so formed that it defines one side wall 44 and the top 46 and bottom 48 walls of the casing. At the front of each of top and bottom walls 46 and 48, vertically projecting mounting ears 50 and 52 respectively are formed as integral portions of main body portion 40 and, as best seen in FIGS. 1 and 2, overlap front web 34 at the top and bottom of opening 36. Mounting ears 50 and 52 are bored and counterbored as at 54 to receive mounting screws 56 which pass through the respective mounting ears and are threadably received within tapped bores in front web 34 to mount the entire lock 20 fixedly upon frame member 22.

'Side cover 42 forms the opposite vertical side wall of the lock casing and is fixedly secured to main body portion 40 as by bolts 58 received in suitably located tapped bores 60 in top and bottom walls 46 and 48 of main body 40. The main inner side surface of side cover 42 is formed as a mirror image of the inner side of side wall 44. Preferably, side cover 42 is formed with projecting tongues 62 which are received in mating grooves 64 on main body 40 to accurately align side cover 42 upon main body 40.

Side cover 42 and side wall 44 each are bored to receive threaded inserts 66 within which are mounted lock cylinders 68 of well known, commercially available construction. As best seen in FIG. 7, the side webs of frame member 22 are bored as at 71 to receive the lock cylinders. Each cylinder 68 includes a lock operating cam 70 having a projecting arm 72, cam 70 being rotatable upon cylinder 68 by manual manipulation of a keyin a well known manner. When cylinders 68 are disposed in their final position within inserts 66, the cylinders are rotatively locked to the insert as by set screws 74 vertically mounted in the lock casing and engageable within locking grooves 76 formed in cylinders 68.

Bottom wall 48 of the lock casing is formed with a pair of upwardly projecting integral lugs 78 which are adapted to be received within complementary grooves 80 formed on the bottom wall of a channel shaped slideway 82. As best seen in FIG. 8, slideway 82 is of generally U-shaped transverse cross-section and is constructed with a horizontal rack tooth section 84 extending along the forward portion of each of the opposed side walls 86 of the slideway 82.

Side walls 86 of slideway 82 are transversely spaced from each other to slideably receive a first bolt member designated generally 88 which, as best seen in FIG. 8, is

of elongate hollow tubular construction having a substantially rectangular transverse cross-section. Slideway 82 forms a guideway within which bolt member 88 is supported for longitudinal reciprocation during operation of the lock. The inner surfaces of the opposed side walls 42, 44 of the lock casing are of like construction and are formed with inwardly projected guide surfaces 90 which are adapted to slideably engage the upper portions of the vertical side surfaces 92 of bolt member 88 above slideway 82. Inwardly projecting flanges 94 extend along the upper edges of guide surfaces 90 to project inwardly into sliding overlying relationship with the upper side surface of bolt member 88. Flanges 94 are relieved as at 96 to afford operating clearance for cams 70, 72. Thus, as best seen in FIG. 7, in the assembled lock, bolt member 88 is slideably engaged on all four exterior surfaces for guided longitudinal movement relative to the lock casing.

At its rearward or inner end, bolt member 88 is formed with an opening 98 in its upper wall which is adapted to operatively receive arms 72 of cams 70. Referring briefly to FIGS. 4 through 6, cam 70 is rotatable relative to its lock cylinder 68 between the extreme positions shown in FIGS. 4 and 6. Rotation of cam 70 causes its arm 72 to engage one or the other of the upper edges of opening 98, depending upon the direction of rotation of cam 70, to shift bolt member 88 between the two extreme positions shown respectively in FIGS. 4 and 6.

It will be noted that when the lock is assembled, the cam arms 72 of both look cylinders 68 are received in opening 98. The structure of the lock cylinders is such that when the arm 72 of one lock cylinder is shifted by manipulation of a key in the lock cylinder from one position to the other, the cam arm 72 of the other lock cylinder is free to follow the motion of the bolt. This permits the actuation of the lock from either side of the door. Since the cam arms 72 thus cannot be operative to positively maintain the bolt in either of its locked or unlocked positions, positive latching of the lock is achieved by the cooperative interengagement of portions of a saddle member designated generally 100, with the first bolt member 88 and a U-shaped recess 102 formed in the inner surface of guide surface 90.

As best seen in FIG. 8, saddle member is of crossshaped configuration when viewed from above, and is formed with a pair of laterally projecting arms 104 which project from opposite sides of the elongate body 106 of member 100. Bolt member 88 is formed with a pair of vertical slots 108 which are open at their upper end and extend downwardly from the top of bolt member 88 in each side wall 92. The width of slots 108 is chosen to slideably receive the arms 104 of slide member 100, the body 106 of slide member 100 being disposed within the interior of member 88 in sliding engagement with the inner surfaces of side walls 92 at the front and rear of slots 108. The vertical thickness of saddle member 100 is such that when arms 104 are received within the respective slots 108, the upper surface of saddle member 100 is maintained in parallel relationship with the top surface of bolt member 88. Saddle member 100 is biased upwardly within slots 108 by a torsion spring 110 which is supported upon a pin 112 press fitted into slots 114 cut into the rear end of bolt member 88.

The lateral extent of arms 104 is such that when saddle member 100 is operatively mounted in bolt member 88, arms 104 project outwardly beyond the respective side walls 92 of the bolt member to be received within the respective U-shaped recesses 102 formed in side Walls 42 and 44 of the lock casing. As best seen in FIGS. 4, 5 and 6, when the lock assembly is in the unlocked position of FIG. 4, arms 104 of saddle member 100 are disposed within theleft-hand or inner leg of U-shaped recess 102 and thus prevent movement of bolt assembly 88 toward the right from the FIG. 4 position until saddle member 100 is depressed, by rotation of cam arm 72. dQWnwardly to the FIG. 5 position, so that saddle member 100 can pass freely beneath the tongue 116 which separates the respective legs of U-shaped recess 102. As best seen in FIG. 6, when the bolt assembly is in its projecting locked position, saddle member 109 is biased upwardly by torsion spring 110 to the position of FIG. 6 in which tongue 116 effectively prevents retracting movement of the bolt assembly until saddle member 100 is depressed by a reversed manipulation of cam arm 72.

A second bolt member designated generally 118 is slideably received within bolt member 88 for telescopic longitudinal movement relative to bolt member 88. To drive bolt member 118 in longitudinal reciprocation relative to bolt member 88, side walls 92 of bolt member 88 are each bored as at 120 to receive and rotatively support an elongate pinion gear 122 for rotation within bores 128. The axial dimension of pinion 122 is such that when the pinion is received within bores 120 it projects outwardly beyond both side walls 92, and the outer ends of the pinion are disposed in meshed engagement with the rack teeth 84 on the respective side walls of slideway 82.

Thus, upon longitudinal reciprocation of bolt member 88 relative to slideway 82, the stationary rack teeth 84 on slideway 82 cause pinion 122 to be driven in rotation. The second or inner bolt member 118 is formed with a series of rack teeth 124- which, when bolt member 118 is received within bolt member 88, are disposed in meshing engagement with pinion 122. The rotative movement of pinion 122 occasioned by reciprocation of bolt member 88 relative to slideway 82 is thus transmitted to inner bolt member 118 to drive bolt member 118 in longitudinal reciprocation relative to bolt member 88 as bolt member 88 is, in turn, reciprocated relative to the casing.

Because rack teeth 84 are stationary and the longitudinal travel of the central axis of rotation of pinion 122 is the same as the longitudinal travel of bolt member 88, the longitudinal movement imparted to bolt member 118 by rotation of pinion 122 is equal to twice the amount of travel for longitudinal movement of bolt member 88 relative to the stationary rack 84. Thus, during movement of the bolt assembly from the unlocked position of FIG. 4 to the locked position of FIG. 6, the total range of longitudinal movement of bolt member 118 relative to the stationary parts of the lock is equal to twice the total longitudinal movement of bolt member 88. Stated another way, the movement of bolt member 118 relative to bolt member 88 is equal to the movement of bolt member 88 relative to the lock casing.

It will be seen from the foregoing detailed description that the present invention provides a lock assembly admirably suited for incorporation in a door stile of conventional depth, and yet provides a bolt throw substantially twice of that obtainable with conventional reciprocating bolt locks. This enables a lock casing of conventional depth of be employed within standard door stiles. At the same time, the increased throw or projection of the lock bolt permits adequate spacing between oppositely disposed edges of double doors, for example, permits utilization of adequate weather stripping, and is still effective against having the door edges spring apart to attempt to free the lock bolt from the recess into which the bolt is projected to lock the door. Also, the positive drive coupling employed between the telescoped bolt members, in cooperation with the locking saddle described above, ensures that both the inner and outer bolt members will be maintained adequately in projected locked position when they have been actuated to such position, whereby it is not readily possible to attempt to pry or otherwise force the bolt members back to retracted position.

While I have described and illustrated a preferred embodiment of my invention, I Wish it to be understood that I do not intend to be restricted solely thereto but that I do intend to cover all modifications thereof which would be apparent to one skilled in the art and which come within the spirit and scope of my invention.

I claim:

1. A lock comprising an elongate telescopic bolt assembly having an inner member telescopically supported within an outer member for longitudinal reciprocation relative to said outer member between a retracted position and a projected position wherein one end of said inner member is projected outwardly from one end of said outer member, means supporting said outer member for longitudinal reciprocation between a retracted unlocked position and a projected locked position wherein the said one end of said outer member is projected outwardly from said supporting means, bolt actuating means for shifting said bolt assembly relative to said supporting means to alternatively locate both of said inner and outer members in their respective retracted positions or to locate both of said inner and outer members in their respective projected positions, and a positive drive coupling means interconnecting said bolt members for causing relative movement between said inner member and said outer member during locking and unlocking movements of said bolt assembly.

2. A lock comprising an elongate telescopic bolt assembly having an inner member slideably supported within an outer member for longitudinal reciprocation relative to said outer member between a retracted position and a projected position wherein one end of said inner member is projected outwardly from one end of said outer member, means supporting said outer member for longitudinal reciprocation along a path wherein said one end of said outer member is shifted between an unlocked position and a locked position wherein said one end of said outer member is projected outwardly from said supporting means, bolt actuating means for shifting said outer member between said unlocked and locked positions, and means responsive to movement of said outer member relative to said supporting means to either of said un locked or locked positions for shifting said inner member relative to said outer member in the same direction as said outer member is shifted relative to said supporting means to thereby shift said inner member to its respective retracted or projected positions.

3. A lock as defined in claim 2 wherein said means responsive to movement of said outer member comprises means for shifting said inner member relative to said outer member in movement equal in direction and magnitude to the direction and magnitude of movement of said outer member relative to said supporting means.

4. A look comprising a lock casing, an elongate bolt assembly mounted in said casing for longitudinal reciprocation relative to said casing between a retracted unlocking position wherein one end of said bolt assembly is located adjacent one side of said casing and a projected locking position wherein said one end of said bolt assembly is projected outwardly from said one side of said casing, bolt shifting means in said casing engageable with said bolt assembly adjacent the other end of said assembly for longitudinally reciprocating said bolt assembly between its locked and unlocked positions, and means in said bolt assembly for magnifying the movement imparted to said other end of said bolt assembly by said shifting means to cause said one end of said bolt assembly to be longitudinally shifted through a distance greater than the longitudinal shifting of said other end of said assembly during movement of said assembly between said locked and unlocked positions.

5. A lock as defined in claim 4 wherein said bolt assembly comprises a first bolt member and a second bolt member, one of said members being telescopically received within the other for longitudinal reciprocation relative thereto, means on said first member engageable with said shifting means for transmitting movement of said shifting means to said bolt assembly, a drive member mounted on said first bolt member for constrained movement relative thereto, means on said drive member engageable with cooperating means on said casing for moving said drive member relative to said first bolt member upon movement of said first bolt member relative to said casing, and means on said second bolt member engageable with said drive member for shifting said second bolt member relative to said first bolt member upon movement of said drive member relative to said first bolt member.

6. A lock as defined in claim wherein said drive member comprises a pinion mounted upon said first bolt member for rotation about an axis normal to the longitudinal extent of said first bolt member, said means on said casing comprises a stationary rack in mesh with said pinion, and said means on said second bolt member comprises a rack in meshed engagement with said pinion at a point diametrically opposed from the point at which said pinion is meshed with said rack on said casing.

7. A lock comprising a lock casing, an elongate hollow tubular first bolt member mounted in said casing for longitudinal reciprocation between a retracted unlocked position wherein one end of said first bolt member is withdrawn to a position adjacent one side of said casing and a projected locked position wherein said one end of said first bolt member is projected outwardly from said one side of said casing, means in said casing engageahle with said first bolt member for shifting said first bolt member between said locked and unlocked positions, a second bolt member telescopically received within said first bolt member for longitudinal reciprocation relative to said first bolt member between a retracted position substantially entirely within said first bolt member and an extended position wherein one end of said second bolt member projects outwardly beyond said one end of said first bolt member, and means operable by movement of said first bolt memebr from its unlocked to its locked position for shifting said second bolt member from its retracted position to its extended position.

8. A lock as defined in claim 7 wherein said means operable by movement of said first bolt member comprises a drive member mounted on said first bolt member for movement relative to said first bolt member, means on said drive member engageable with cooperating means on said casing for moving said drive member relative to said first bolt member upon movement of said first bolt member relative to said casing, and means on said second bolt member engaged with said drive member for shifting said second bolt member relative to said first bolt member upon movement of said drive member relative to said first bolt member.

9. A lock as defined in claim 7 wherein said means operable by movement of said first bolt member comprises a drive member mounted on said first bolt member for rotation relative to said first bolt member, means on said casing engageable with said drive member for rotating said drive member upon movement of said first bolt member relative to said casing, and means on said second bolt member engaged with said drive member for transforming rotation of said drive member into longitudinal movement of said second bolt member.

10. A lock comprising a lock casing, an elongate hollow tubular first bolt member mounted in said casing for longitudinal reciprocation between a retracted unlocked position wherein one end of said first bolt member is withdrawn to a position adjacent one side of said casing and a projected locked position wherein said one end of said first bolt member is projected outwardly from said one side of said casing, means in said casing engageable with said first bolt member for shifting said first bolt member between said locked and said unlocked positions, a pinion gear mounted upon said first bolt member for rotation about an axis extending transversely of said first bolt member, stationary rack means on said casing in mesh with pinion gear for driving said pinion gear in rotation upon longitudinal movement of said first bolt member relative to said casing, a second bolt member telescopically received within said first bolt member for longitudinal reciprocation relative to said first bolt member between a retracted position substantially entirely within said first bolt member and a projected position wherein one end of said second bolt member projects outwardly beyond said one end of said first bolt member, and a rack tooth section on said second bolt member meshed with said pinion gear for reciprocating said second bolt member relative to said first bolt member upon rotation of said pinion gear to shift said second bolt member from its retracted position to its extended position upon movement of said first bolt member from its unlocked to its locked position, and to return said second bolt member from its projected position to its retracted position upon movement of said first bolt member from its locked position to its unlocked position.

11. A lock comprising an elongate telescopic bolt assembly having a first bolt member slideably supported with respect to a second bolt member for longitudinal reciprocation relative to said second ,bolt member between a retracted position and a projected position wherein said first bolt member projects outwardly with respect to one end of said second bolt member, means supportmg said bolt assembly for longitudinal reciprocation along a path wherein said one end of said second bolt member is shifted between a retracted unlocked position and a projected locked position and vice versa on movement of said bolt assembly to locked and unlocked positions, respectively, and bolt assembly actuating means for simultaneously shifting both said first and second bolt members to their respective retracted or projected positions, said bolt assembly actuating means including a positive drive coupling between said first and said second bolt members.

12. In a lock, an elongate bolt assembly comprising a first elongate bolt member movable between a retracted unlocked position and a projected locked position, and vice versa, and a second elongate bolt member movably supported by said first bolt member for movement between a retracted locked position and a projected unlocked position, and vice versa, said second bolt member being supported by said first bolt member for movement with respect to said first bolt member while the latter is moving from its retracted position to its projected position, or vice versa, and means for moving said second bolt member relative to said first bolt member as said first bolt member is moved to the stated positions.

13. In a lock, an elongate bolt assembly comprising a first bolt member, a second bolt member mounted with respect to said first bolt member for longitudinal reciprocation with respect thereto, a first gear means carried by said first bolt member, and a second gear means carried by said second bolt member, said respective gear means meshing with each other and being operative to move said second bolt member with respect to said first bolt member when the latter is moved.

14. In a lock, a housing, an elongate bolt assembly comprising a first bolt member, a second bolt member mounted on said first bolt member for longitudinal reciprocation with respect thereto, gear means operating between said housing, said first bolt member and said sggond bolt member, said gear means being operative to move said second bolt member with respect to said first bolt member when said first bolt member is moved relative to said housing.

15. A lock comprising a longitudinally expandable bolt assembly having an inner member slidably supported within an outer member for longitudinal reciprocation relative to said outer member between a retracted position wherein said inner member is located within said outer member and a projected position wherein said inner member projects outwardly from one end of said outer member, means supporting said bolt assembly for longitudinal reciprocation along a path wherein said one 9 10 end of said outer member is shifted between a retracted References Cited by the Examiner unlocked and a projected locked position and vice versa, UNITED STATES PATENTS means interconnecting said bolt members so that they are simultaneously moved relative to said supporting means and relative to each other, and bolt assembly 5 1203965 11/1916 Bogenberggr 292 21 actuating means for said assembly between Palinkas said retracted and projected positions, and vice versa, 1,777,105 9/1930 Perebenda 70 118 whereby the longitudinal dimension 0f said bolt assem- 1 994 095 3 1935 l ll 70 120 bly is increased during projecting movements of said bolt 2 010 4 1 3 193 5 Miuigan 7 21 assembly and the longitudinal dimension of said bolt 10 2 32 711 4 1959 Clift 7() 134 X assembly is decreased during movement of same to a retracted position. ALBERT H. KAMPE, Primary Examiner. 

15. A LOCK COMPRISING A LONGITUDINALLY EXPANDABLE BOLT ASSEMBLY HAVING AN INNER MEMBER SLIDABLY SUPPORTED WITHIN AN OUTER MEMBER FOR LONGITUDINAL RECIPROCATION RELATIVE TO SAID OUTER MEMBER BETWEEN A RETRACTED POSITION WHEREIN SAID INNER MEMBER IS LOCATED WITHIN SAID OUTER MEMBER AND A PROJECTED POSITION WHEREIN SAID INNER MEMBER PROJECTS OUTWARDLY FROM ONE END OF SAID OUTER MEMBER, MEANS SUPPORTING SAID BOLT ASSEMBLY FOR LONGITUDIANLLY RECIPROCATION ALONG A PATH WHEREIN SAID ONE END OF SAID OUTER MEMBER IS SHIFTED BETWEEN A RETRACTED UNLOCKED AND A PROJECTED LOCKED POSITION AND VICE VERSA, MEANS INTERCONNECTING SAID BOLT MEMBERS SO THAT THEY ARE SIMULTANEOUSLY MOVED RELATIVE TO SAID SUPPORTING MEANS AND RELATIVE TO EACH OTHER, AND BOLT ASSEMBLY 